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adding input buffering to bus arbiters to reduce backpressure delay propagation

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This commit is contained in:
Blaise Tine
2020-12-05 17:31:29 -08:00
parent 13a5370254
commit d0f2a3984d
17 changed files with 480 additions and 338 deletions
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86
hw/rtl/VX_cluster.v
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@@ -207,38 +207,38 @@ module VX_cluster #(
.TAG_IN_WIDTH (`DCORE_TAG_WIDTH),
.TAG_OUT_WIDTH (`L2CORE_TAG_WIDTH)
) io_arb (
.clk (clk),
.reset (reset),
.clk (clk),
.reset (reset),
// input requests
.io_req_valid_in (per_core_io_req_valid),
.io_req_rw_in (per_core_io_req_rw),
.io_req_byteen_in (per_core_io_req_byteen),
.io_req_addr_in (per_core_io_req_addr),
.io_req_data_in (per_core_io_req_data),
.io_req_tag_in (per_core_io_req_tag),
.io_req_ready_in (per_core_io_req_ready),
.req_valid_in (per_core_io_req_valid),
.req_rw_in (per_core_io_req_rw),
.req_byteen_in (per_core_io_req_byteen),
.req_addr_in (per_core_io_req_addr),
.req_data_in (per_core_io_req_data),
.req_tag_in (per_core_io_req_tag),
.req_ready_in (per_core_io_req_ready),
// output request
.io_req_valid_out (io_req_valid),
.io_req_rw_out (io_req_rw),
.io_req_byteen_out (io_req_byteen),
.io_req_addr_out (io_req_addr),
.io_req_data_out (io_req_data),
.io_req_tag_out (io_req_tag),
.io_req_ready_out (io_req_ready),
.req_valid_out (io_req_valid),
.req_rw_out (io_req_rw),
.req_byteen_out (io_req_byteen),
.req_addr_out (io_req_addr),
.req_data_out (io_req_data),
.req_tag_out (io_req_tag),
.req_ready_out (io_req_ready),
// input responses
.io_rsp_valid_in (per_core_io_rsp_valid),
.io_rsp_data_in (per_core_io_rsp_data),
.io_rsp_tag_in (per_core_io_rsp_tag),
.io_rsp_ready_in (per_core_io_rsp_ready),
.rsp_valid_in (per_core_io_rsp_valid),
.rsp_data_in (per_core_io_rsp_data),
.rsp_tag_in (per_core_io_rsp_tag),
.rsp_ready_in (per_core_io_rsp_ready),
// output response
.io_rsp_valid_out (io_rsp_valid),
.io_rsp_tag_out (io_rsp_tag),
.io_rsp_data_out (io_rsp_data),
.io_rsp_ready_out (io_rsp_ready)
.rsp_valid_out (io_rsp_valid),
.rsp_tag_out (io_rsp_tag),
.rsp_data_out (io_rsp_data),
.rsp_ready_out (io_rsp_ready)
);
VX_csr_io_arb #(
@@ -246,34 +246,34 @@ module VX_cluster #(
.DATA_WIDTH (32),
.ADDR_WIDTH (12)
) csr_io_arb (
.clk (clk),
.reset (reset),
.clk (clk),
.reset (reset),
.request_id (csr_io_req_coreid),
.request_id (csr_io_req_coreid),
// input requests
.csr_io_req_valid_in (csr_io_req_valid),
.csr_io_req_addr_in (csr_io_req_addr),
.csr_io_req_rw_in (csr_io_req_rw),
.csr_io_req_data_in (csr_io_req_data),
.csr_io_req_ready_in (csr_io_req_ready),
.req_valid_in (csr_io_req_valid),
.req_addr_in (csr_io_req_addr),
.req_rw_in (csr_io_req_rw),
.req_data_in (csr_io_req_data),
.req_ready_in (csr_io_req_ready),
// output request
.csr_io_req_valid_out (per_core_csr_io_req_valid),
.csr_io_req_addr_out (per_core_csr_io_req_addr),
.csr_io_req_rw_out (per_core_csr_io_req_rw),
.csr_io_req_data_out (per_core_csr_io_req_data),
.csr_io_req_ready_out (per_core_csr_io_req_ready),
.req_valid_out (per_core_csr_io_req_valid),
.req_addr_out (per_core_csr_io_req_addr),
.req_rw_out (per_core_csr_io_req_rw),
.req_data_out (per_core_csr_io_req_data),
.req_ready_out (per_core_csr_io_req_ready),
// input responses
.csr_io_rsp_valid_in (per_core_csr_io_rsp_valid),
.csr_io_rsp_data_in (per_core_csr_io_rsp_data),
.csr_io_rsp_ready_in (per_core_csr_io_rsp_ready),
.rsp_valid_in (per_core_csr_io_rsp_valid),
.rsp_data_in (per_core_csr_io_rsp_data),
.rsp_ready_in (per_core_csr_io_rsp_ready),
// output response
.csr_io_rsp_valid_out (csr_io_rsp_valid),
.csr_io_rsp_data_out (csr_io_rsp_data),
.csr_io_rsp_ready_out (csr_io_rsp_ready)
.rsp_valid_out (csr_io_rsp_valid),
.rsp_data_out (csr_io_rsp_data),
.rsp_ready_out (csr_io_rsp_ready)
);
assign busy = (| per_core_busy);